The purpose of this study is to determine if disturbances in cytokines or factors of the metabolic syndrome, can predict complications in pregnancy, birth, and the perinatal period in pregnant women with type 2 diabetes or who are overweight. At the same time we, the investigators at Rigshospitalet, want to determine if physical activity in the overweight pregnant woman can influence these factors in a favourable way and, with that, improve the progress of pregnancy and birth.